Ingot metallurgy alloys of aluminum with lithium additions offer large gains in structural efficiency due to reduced density together with increased strength and elastic modulus. Several alloys are now commercially available. The Navy has been sponsoring R&D activities in these alloys since the mid-seventies. Current efforts include ongoing multi-laboratory evaluations of aluminium-lithium alloys to replace 7075-T6 and 7075-T73. The Navy is also conducting R&D on thermal mechanical processing and superplastic forming on these alloys. Additional testing is being conducted to determine their corrosion resistance in an aircraft carrier environment. Keywords: Alloys, Metallurgy, Naval aircraft, RA-5C Vigilante, Symposia, Mechanical properties. (JG)


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